Initial commit

13 files changed, 385 insertions, 0 deletions

diff --git a/frontend/src/App.css b/frontend/src/App.css
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--- /dev/null
+++ b/frontend/src/App.css
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+.App {
+  margin: 1rem;
+}
+
+.App-logo {
+  height: 40vmin;
+  pointer-events: none;
+}
+
+@media (prefers-reduced-motion: no-preference) {
+  .App-logo {
+    animation: App-logo-spin infinite 20s linear;
+  }
+}
+
+.App-header {
+  background-color: #282c34;
+  min-height: 100vh;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  font-size: calc(10px + 2vmin);
+  color: white;
+}
+
+.App-link {
+  color: #61dafb;
+}
+
+@keyframes App-logo-spin {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}
+
+.error {
+  color: red;
+}
+
+.warning {
+  color: burlywood;
+}
+
+input,
+button {
+  display: block;
+}
diff --git a/frontend/src/App.js b/frontend/src/App.js
new file mode 100644
index 0000000..af2f99d
--- /dev/null
+++ b/frontend/src/App.js
@@ -0,0 +1,34 @@
+import React, { useEffect } from 'react';
+import { Router } from '@reach/router';
+
+import Login from './Login';
+import Home from './Home';
+import userState from './UserState';
+import './App.css';
+import axios from './axios';
+
+const App = () => {
+  useEffect(() => {
+    const fetchUserInfo = async () => {
+      try {
+        const resp = await axios.get('/user');
+        const { username } = resp.data;
+        userState.username = username;
+      } catch (err) {
+        console.error(err);
+      }
+    };
+    fetchUserInfo();
+  }, []);
+
+  return (
+    <div className="App">
+      <Router>
+        <Login path="/login" />
+        <Home path="/" />
+      </Router>
+    </div>
+  );
+};
+
+export default App;
diff --git a/frontend/src/App.test.js b/frontend/src/App.test.js
new file mode 100644
index 0000000..4db7ebc
--- /dev/null
+++ b/frontend/src/App.test.js
@@ -0,0 +1,9 @@
+import React from 'react';
+import { render } from '@testing-library/react';
+import App from './App';
+
+test('renders learn react link', () => {
+  const { getByText } = render(<App />);
+  const linkElement = getByText(/learn react/i);
+  expect(linkElement).toBeInTheDocument();
+});
diff --git a/frontend/src/Home.js b/frontend/src/Home.js
new file mode 100644
index 0000000..bf98bf1
--- /dev/null
+++ b/frontend/src/Home.js
@@ -0,0 +1,20 @@
+import React from 'react';
+import { observer } from 'mobx-react';
+
+import LogoutBtn from './LogoutBtn';
+import userState from './UserState';
+
+const Home = observer(({ user }) => {
+  if (!user.username) {
+    return 'Loading...';
+  }
+
+  return (
+    <div>
+      <LogoutBtn />
+      Hello {user.username}!
+    </div>
+  );
+});
+
+export default () => <Home user={userState} />;
diff --git a/frontend/src/Login.js b/frontend/src/Login.js
new file mode 100644
index 0000000..e30b496
--- /dev/null
+++ b/frontend/src/Login.js
@@ -0,0 +1,44 @@
+import React, { useState } from 'react';
+import { useForm } from 'react-hook-form';
+import { navigate } from '@reach/router';
+
+import axios from './axios';
+import userState from './UserState';
+
+const Login = () => {
+  const { register, handleSubmit, watch, errors } = useForm();
+  const [ loginError, setLoginError ] = useState(null);
+
+  const onSubmit = async data => {
+    try {
+      const resp = await axios.post('/login', data);
+      const { username } = resp.data;
+      userState.username = username;
+      navigate('/');
+    } catch (err) {
+      if (err.response && err.response.data) {
+        setLoginError(err.response.data.error);
+      } else {
+        console.error(err);
+        setLoginError('Unknown error occurred. See console for details.');
+      }
+    }
+  };
+
+  return (
+    <form onSubmit={handleSubmit(onSubmit)}>
+      <h1>Log in</h1>
+      <label>
+        Username <input name="username" type="text" ref={register} required />
+      </label>
+      <label>
+        Password <input name="password" type="password" ref={register} required />
+      </label>
+      <button type="submit">Log in</button>
+      <div className="error">{loginError}</div>
+      {/* <div className="error">{errors}</div> */}
+    </form>
+  );
+};
+
+export default Login;
diff --git a/frontend/src/LogoutBtn.js b/frontend/src/LogoutBtn.js
new file mode 100644
index 0000000..f8b1827
--- /dev/null
+++ b/frontend/src/LogoutBtn.js
@@ -0,0 +1,22 @@
+import React from 'react';
+import { navigate } from '@reach/router';
+import { observer } from 'mobx-react';
+
+import axios from './axios';
+import userState from './UserState';
+
+const LogoutBtn = observer(({ user }) => {
+  const doLogout = async () => {
+    await axios.post('/logout');
+    user.username = null;
+    navigate('/login');
+  };
+
+  return (
+    <button onClick={doLogout} type="button">
+      Log out
+    </button>
+  );
+});
+
+export default () => <LogoutBtn user={userState} />;
diff --git a/frontend/src/UserState.js b/frontend/src/UserState.js
new file mode 100644
index 0000000..21c2587
--- /dev/null
+++ b/frontend/src/UserState.js
@@ -0,0 +1,12 @@
+import { observable, decorate } from 'mobx';
+
+class UserState {
+  username = null;
+}
+
+decorate(UserState, {
+  username: observable,
+});
+
+const userState = new UserState();
+export default userState;
diff --git a/frontend/src/axios.js b/frontend/src/axios.js
new file mode 100644
index 0000000..f55b37f
--- /dev/null
+++ b/frontend/src/axios.js
@@ -0,0 +1,21 @@
+import axios from 'axios';
+import { navigate } from '@reach/router';
+
+axios.defaults.baseURL = process.env.REACT_APP_API_BASE_URL || 'http://localhost:4000';
+axios.defaults.withCredentials = true;
+
+axios.interceptors.response.use(
+  response => {
+    // Do something with response data
+    return response;
+  },
+  err => {
+    // Do something with response error
+    if (err.response && err.response.status === 403) {
+      navigate(`/login`);
+    }
+    return Promise.reject(err);
+  },
+);
+
+export default axios;
diff --git a/frontend/src/index.css b/frontend/src/index.css
new file mode 100644
index 0000000..7323ae8
--- /dev/null
+++ b/frontend/src/index.css
@@ -0,0 +1,11 @@
+body {
+  margin: 0;
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans',
+    'Droid Sans', 'Helvetica Neue', sans-serif;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+code {
+  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New', monospace;
+}
diff --git a/frontend/src/index.js b/frontend/src/index.js
new file mode 100644
index 0000000..87d1be5
--- /dev/null
+++ b/frontend/src/index.js
@@ -0,0 +1,12 @@
+import React from 'react';
+import ReactDOM from 'react-dom';
+import './index.css';
+import App from './App';
+import * as serviceWorker from './serviceWorker';
+
+ReactDOM.render(<App />, document.getElementById('root'));
+
+// If you want your app to work offline and load faster, you can change
+// unregister() to register() below. Note this comes with some pitfalls.
+// Learn more about service workers: https://bit.ly/CRA-PWA
+serviceWorker.unregister();
diff --git a/frontend/src/logo.svg b/frontend/src/logo.svg
new file mode 100644
index 0000000..6b60c10
--- /dev/null
+++ b/frontend/src/logo.svg
@@ -0,0 +1,7 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3">
+    <g fill="#61DAFB">
+        <path d="M666.3 296.5c0-32.5-40.7-63.3-103.1-82.4 14.4-63.6 8-114.2-20.2-130.4-6.5-3.8-14.1-5.6-22.4-5.6v22.3c4.6 0 8.3.9 11.4 2.6 13.6 7.8 19.5 37.5 14.9 75.7-1.1 9.4-2.9 19.3-5.1 29.4-19.6-4.8-41-8.5-63.5-10.9-13.5-18.5-27.5-35.3-41.6-50 32.6-30.3 63.2-46.9 84-46.9V78c-27.5 0-63.5 19.6-99.9 53.6-36.4-33.8-72.4-53.2-99.9-53.2v22.3c20.7 0 51.4 16.5 84 46.6-14 14.7-28 31.4-41.3 49.9-22.6 2.4-44 6.1-63.6 11-2.3-10-4-19.7-5.2-29-4.7-38.2 1.1-67.9 14.6-75.8 3-1.8 6.9-2.6 11.5-2.6V78.5c-8.4 0-16 1.8-22.6 5.6-28.1 16.2-34.4 66.7-19.9 130.1-62.2 19.2-102.7 49.9-102.7 82.3 0 32.5 40.7 63.3 103.1 82.4-14.4 63.6-8 114.2 20.2 130.4 6.5 3.8 14.1 5.6 22.5 5.6 27.5 0 63.5-19.6 99.9-53.6 36.4 33.8 72.4 53.2 99.9 53.2 8.4 0 16-1.8 22.6-5.6 28.1-16.2 34.4-66.7 19.9-130.1 62-19.1 102.5-49.9 102.5-82.3zm-130.2-66.7c-3.7 12.9-8.3 26.2-13.5 39.5-4.1-8-8.4-16-13.1-24-4.6-8-9.5-15.8-14.4-23.4 14.2 2.1 27.9 4.7 41 7.9zm-45.8 106.5c-7.8 13.5-15.8 26.3-24.1 38.2-14.9 1.3-30 2-45.2 2-15.1 0-30.2-.7-45-1.9-8.3-11.9-16.4-24.6-24.2-38-7.6-13.1-14.5-26.4-20.8-39.8 6.2-13.4 13.2-26.8 20.7-39.9 7.8-13.5 15.8-26.3 24.1-38.2 14.9-1.3 30-2 45.2-2 15.1 0 30.2.7 45 1.9 8.3 11.9 16.4 24.6 24.2 38 7.6 13.1 14.5 26.4 20.8 39.8-6.3 13.4-13.2 26.8-20.7 39.9zm32.3-13c5.4 13.4 10 26.8 13.8 39.8-13.1 3.2-26.9 5.9-41.2 8 4.9-7.7 9.8-15.6 14.4-23.7 4.6-8 8.9-16.1 13-24.1zM421.2 430c-9.3-9.6-18.6-20.3-27.8-32 9 .4 18.2.7 27.5.7 9.4 0 18.7-.2 27.8-.7-9 11.7-18.3 22.4-27.5 32zm-74.4-58.9c-14.2-2.1-27.9-4.7-41-7.9 3.7-12.9 8.3-26.2 13.5-39.5 4.1 8 8.4 16 13.1 24 4.7 8 9.5 15.8 14.4 23.4zM420.7 163c9.3 9.6 18.6 20.3 27.8 32-9-.4-18.2-.7-27.5-.7-9.4 0-18.7.2-27.8.7 9-11.7 18.3-22.4 27.5-32zm-74 58.9c-4.9 7.7-9.8 15.6-14.4 23.7-4.6 8-8.9 16-13 24-5.4-13.4-10-26.8-13.8-39.8 13.1-3.1 26.9-5.8 41.2-7.9zm-90.5 125.2c-35.4-15.1-58.3-34.9-58.3-50.6 0-15.7 22.9-35.6 58.3-50.6 8.6-3.7 18-7 27.7-10.1 5.7 19.6 13.2 40 22.5 60.9-9.2 20.8-16.6 41.1-22.2 60.6-9.9-3.1-19.3-6.5-28-10.2zM310 490c-13.6-7.8-19.5-37.5-14.9-75.7 1.1-9.4 2.9-19.3 5.1-29.4 19.6 4.8 41 8.5 63.5 10.9 13.5 18.5 27.5 35.3 41.6 50-32.6 30.3-63.2 46.9-84 46.9-4.5-.1-8.3-1-11.3-2.7zm237.2-76.2c4.7 38.2-1.1 67.9-14.6 75.8-3 1.8-6.9 2.6-11.5 2.6-20.7 0-51.4-16.5-84-46.6 14-14.7 28-31.4 41.3-49.9 22.6-2.4 44-6.1 63.6-11 2.3 10.1 4.1 19.8 5.2 29.1zm38.5-66.7c-8.6 3.7-18 7-27.7 10.1-5.7-19.6-13.2-40-22.5-60.9 9.2-20.8 16.6-41.1 22.2-60.6 9.9 3.1 19.3 6.5 28.1 10.2 35.4 15.1 58.3 34.9 58.3 50.6-.1 15.7-23 35.6-58.4 50.6zM320.8 78.4z"/>
+        <circle cx="420.9" cy="296.5" r="45.7"/>
+        <path d="M520.5 78.1z"/>
+    </g>
+</svg>
diff --git a/frontend/src/serviceWorker.js b/frontend/src/serviceWorker.js
new file mode 100644
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--- /dev/null
+++ b/frontend/src/serviceWorker.js
@@ -0,0 +1,137 @@
+// This optional code is used to register a service worker.
+// register() is not called by default.
+
+// This lets the app load faster on subsequent visits in production, and gives
+// it offline capabilities. However, it also means that developers (and users)
+// will only see deployed updates on subsequent visits to a page, after all the
+// existing tabs open on the page have been closed, since previously cached
+// resources are updated in the background.
+
+// To learn more about the benefits of this model and instructions on how to
+// opt-in, read https://bit.ly/CRA-PWA
+
+const isLocalhost = Boolean(
+  window.location.hostname === 'localhost' ||
+    // [::1] is the IPv6 localhost address.
+    window.location.hostname === '[::1]' ||
+    // 127.0.0.0/8 are considered localhost for IPv4.
+    window.location.hostname.match(
+      /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
+    )
+);
+
+export function register(config) {
+  if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
+    // The URL constructor is available in all browsers that support SW.
+    const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
+    if (publicUrl.origin !== window.location.origin) {
+      // Our service worker won't work if PUBLIC_URL is on a different origin
+      // from what our page is served on. This might happen if a CDN is used to
+      // serve assets; see https://github.com/facebook/create-react-app/issues/2374
+      return;
+    }
+
+    window.addEventListener('load', () => {
+      const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
+
+      if (isLocalhost) {
+        // This is running on localhost. Let's check if a service worker still exists or not.
+        checkValidServiceWorker(swUrl, config);
+
+        // Add some additional logging to localhost, pointing developers to the
+        // service worker/PWA documentation.
+        navigator.serviceWorker.ready.then(() => {
+          console.log(
+            'This web app is being served cache-first by a service ' +
+              'worker. To learn more, visit https://bit.ly/CRA-PWA'
+          );
+        });
+      } else {
+        // Is not localhost. Just register service worker
+        registerValidSW(swUrl, config);
+      }
+    });
+  }
+}
+
+function registerValidSW(swUrl, config) {
+  navigator.serviceWorker
+    .register(swUrl)
+    .then(registration => {
+      registration.onupdatefound = () => {
+        const installingWorker = registration.installing;
+        if (installingWorker == null) {
+          return;
+        }
+        installingWorker.onstatechange = () => {
+          if (installingWorker.state === 'installed') {
+            if (navigator.serviceWorker.controller) {
+              // At this point, the updated precached content has been fetched,
+              // but the previous service worker will still serve the older
+              // content until all client tabs are closed.
+              console.log(
+                'New content is available and will be used when all ' +
+                  'tabs for this page are closed. See https://bit.ly/CRA-PWA.'
+              );
+
+              // Execute callback
+              if (config && config.onUpdate) {
+                config.onUpdate(registration);
+              }
+            } else {
+              // At this point, everything has been precached.
+              // It's the perfect time to display a
+              // "Content is cached for offline use." message.
+              console.log('Content is cached for offline use.');
+
+              // Execute callback
+              if (config && config.onSuccess) {
+                config.onSuccess(registration);
+              }
+            }
+          }
+        };
+      };
+    })
+    .catch(error => {
+      console.error('Error during service worker registration:', error);
+    });
+}
+
+function checkValidServiceWorker(swUrl, config) {
+  // Check if the service worker can be found. If it can't reload the page.
+  fetch(swUrl, {
+    headers: { 'Service-Worker': 'script' }
+  })
+    .then(response => {
+      // Ensure service worker exists, and that we really are getting a JS file.
+      const contentType = response.headers.get('content-type');
+      if (
+        response.status === 404 ||
+        (contentType != null && contentType.indexOf('javascript') === -1)
+      ) {
+        // No service worker found. Probably a different app. Reload the page.
+        navigator.serviceWorker.ready.then(registration => {
+          registration.unregister().then(() => {
+            window.location.reload();
+          });
+        });
+      } else {
+        // Service worker found. Proceed as normal.
+        registerValidSW(swUrl, config);
+      }
+    })
+    .catch(() => {
+      console.log(
+        'No internet connection found. App is running in offline mode.'
+      );
+    });
+}
+
+export function unregister() {
+  if ('serviceWorker' in navigator) {
+    navigator.serviceWorker.ready.then(registration => {
+      registration.unregister();
+    });
+  }
+}
diff --git a/frontend/src/setupTests.js b/frontend/src/setupTests.js
new file mode 100644
index 0000000..74b1a27
--- /dev/null
+++ b/frontend/src/setupTests.js
@@ -0,0 +1,5 @@
+// jest-dom adds custom jest matchers for asserting on DOM nodes.
+// allows you to do things like:
+// expect(element).toHaveTextContent(/react/i)
+// learn more: https://github.com/testing-library/jest-dom
+import '@testing-library/jest-dom/extend-expect';